Delete row sig_d289994c56aa from signals

id sig_d289994c56aa
event_id evt_a5e587416240
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_4bfb320e4 ...
dedupe_key signal_enriched:news_delta:4b7c44a801e85074
throttle_s 0
created_at 2026-04-19T20:59:43.988798+00:00
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